Average Deal Size: What It Is and How to Calculate It

Average deal size is the average monetary value of the deals a business wins during a defined period. It is calculated by dividing the total value of won deals by the number of won deals.

The metric shows what a closed sale is worth on average. The calculation is simple, but the result is useful only when every deal uses the same currency and value basis.

What is average deal size?

Average deal size summarizes completed sales as one number. A business might calculate it for a month, quarter or year, either across the company or for a specific product, customer group, channel or team.

Only won deals belong in the basic calculation. Open opportunities are still uncertain, while lost deals produced no sale. A sales pipeline can hold active opportunities; average deal size describes sales that have closed successfully.

The metric is sometimes called average sales value. Whatever name the business uses, it should document exactly what "deal value" means.

Why does it matter?

Average deal size can help a business:

• establish a baseline for the value of a closed sale;
• compare consistent periods or segments;
• estimate how many wins may be needed to reach a sales target;
• notice changes in customer or product mix;
• provide one input for a sales forecast.

A higher average may reflect better pricing or larger customers. It may also result from one exceptional contract or fewer small deals, so context matters.

The formula

Average deal size = Total value of won deals / Number of won deals

Before calculating, define:

1. The period: for example, one calendar quarter.
2. The population: for example, new-business deals won by one team.
3. The value basis: for example, one-time contract value or monthly recurring value.

Use the same currency and value basis throughout. Do not add a one-off project price to one month of a recurring contract unless that is the documented rule for every deal.

Use the final agreed value after discounts. If a quoted project falls from EUR 5,000 to EUR 4,500 before signing, use EUR 4,500.

A simple example

Hypothetical example: A small design studio wins four website projects during one quarter.

The studio calculates:

EUR 15,000 / 4 won deals = EUR 3,750 average deal size

The mean value of a won project was EUR 3,750. This does not mean the next project will be worth exactly that amount.

As a rough planning input, the studio might estimate that EUR 30,000 in sales requires eight similar wins:

EUR 30,000 / EUR 3,750 = 8 won deals

The estimate is useful only if future deals resemble those in the calculation.

When should you use it?

Calculate average deal size when reviewing won business, planning sales capacity or targets, comparing like-for-like periods, or checking whether contract values are changing.

Choose a period with enough wins to be informative. A weekly average based on one deal says little. For a low-volume business, a quarter or year may be more useful than a month.

How to interpret the result

Compare the average with the same metric from an earlier, comparable period, then investigate why it changed.

A rising average may indicate higher prices, larger customers, broader scope or successful upselling. A falling average may reflect discounts, smaller customers, a lower-priced offer or a deliberate move toward simpler sales.

Always review the number of won deals and total won value alongside the average. One EUR 20,000 win produces a higher average than ten EUR 3,000 wins, but the ten deals produce more total value.

Segment the calculation when unlike deals hide the pattern. Separate new contracts from renewals or one-off projects from recurring agreements. The goal is a consistent number that supports a decision, not the largest possible number.

Common confusion

Average deal size is not median deal size. The average adds all won values and divides by the number of wins. The median is the middle value after deals are ordered from smallest to largest.

One unusually large deal can pull the average upward. The median is less affected by extremes, so viewing both helps show whether the average represents a typical deal.

Average deal size also differs from average selling price, which often refers to one unit, and average order value, which usually describes orders in a transaction-based business.

Common mistakes

• Including open or lost opportunities: use won deals only.
• Mixing value bases: apply one consistent rule to monthly fees, annual values and one-time prices.
• Ignoring discounts: use the final agreed value.
• Comparing unlike periods: changes in product, customer or channel mix can mislead.
• Using the average alone: also review deal count, total won value and the distribution of values.

Limitations

Average deal size is an arithmetic mean, so unusually large or small wins can distort it. It says nothing about profit, payment timing, selling cost or time to close. A large contract may be unattractive if its margin is weak or it consumes excessive effort. Use the metric as one part of a broader sales review.

Quick checklist

Put it to work

Calculate a useful average deal size in 20 minutes

1. Choose one completed month, quarter or year.
2. Export or list every deal marked closed won during that period.
3. Select one value basis and one currency.
4. Add the final values, after agreed discounts.
5. Divide the total by the number of won deals.
6. Order the deal values and find the median.
7. Write one sentence explaining the result: Our average changed mainly because ______.

Repeat the same calculation for the next comparable period before treating the number as a trend.

Your won deals, in context

Period

Won-deal population

Value basis

CurrencyEURUSDGBPOne currency for all entries. Changing it does not convert values.

Final won-deal values (one per line)

Closed-won deals only, after discounts. Up to 200 values; decimals use a dot or comma. No thousands separators.

No won deals entered yet.

Sales target (optional, same value basis)

Same period definition, population, currency and value basis as the planning assumption.

Uses the unrounded average and rounds wins up. Similar future deals are an assumption, not a forecast.

Our average changed mainly because...

Values shown to two decimals. The calculation cannot verify deal status or consistency. Deal value is not profit or cash received.

Key takeaways

• Average deal size equals total won value divided by the number of won deals.
• The period, population, currency and value basis must stay consistent.
• Open and lost opportunities do not belong in the basic calculation.
• A higher average is not automatically better; deal count and total won value provide essential context.
• The median helps reveal whether one unusual deal is distorting the average.

Final takeaway

Average deal size shows the mean value of the deals a business wins. Divide total won value by the number of won deals, using one period, currency, population and value basis.

Track it consistently, investigate why it changes, and pair it with deal count and total won value before making decisions.